I was looking at the BabyCenter site that was emailed to me for Broster's 18th week, and was entertained by a comment left by another expecting mother. . .
I find that if you are in a place where you are sitting very still for a period of time and paying attention (church, 12 Step meeting, doctors office) you are more likely to feel the baby. Watching TV counts only sometimes, since your mind and other senses are very engaged.
Maybe I'm wrong, but shouldn't your mind be engaged in church, or a 12 step meeting? I kinda thought that was the point.